CN111878452A - Impeller assembly for multistage submersible pump - Google Patents

Abstract

The invention discloses an impeller assembly for a multi-stage submersible pump, which comprises an impeller shell. The impeller shell is provided with an impeller, a guide vane and a mouth ring. The impeller is sleeved on a pump shaft and can slide axially along the pump shaft. The lower end is provided with a liquid inlet part, and the fluid medium enters the impeller through the liquid inlet part; the guide vane is arranged above the impeller, and is inserted and fixed with the impeller shell, and a liquid outlet cavity connected with the liquid flow channel is formed between the impeller and the impeller shell; the impeller The top surface of the shell is provided with a liquid outlet, which is communicated with the liquid outlet cavity; the guide vane is floating and sleeved on the pump shaft; the port ring is movably arranged between the outer side of the liquid inlet part and the inner side of the impeller shell through the port ring seat. In the present invention, the axial force generated by the rotation of the impeller is supported by the guide vane floating on the pump shaft, which improves the balance effect of the axial force of the impeller; The wear between them causes the gap of the mouth ring to increase, which improves the sealing performance of the mouth ring.

Description

An impeller assembly for a multistage submersible pump

technical field

The invention relates to the technical field of multi-stage submersible pumps, in particular to an impeller assembly for multi-stage submersible pumps.

Background technique

Submersible pump is an important equipment for deep well water lifting. It is often used in water lifting projects such as rivers, reservoirs and canals, farmland irrigation and water for people and animals in high mountains. It can also be used for central air conditioning cooling, heat pump units, cold pump units, cities, factories, railways, It is used for mine and construction site drainage, which consists of four parts: water pump, submersible motor, water pipe and control switch. The water pump includes a pump shaft connected with the submersible motor and an impeller arranged on the pump shaft. The multi-stage submersible pump is generally composed of 2-4 groups of impellers. The impeller includes the pump casing and the impeller and guide vanes arranged in the pump casing. During the working process of the impeller, the liquid enters from the suction port of the impeller. The impeller flow channel composed of the cover plate, when the liquid passes through the impeller flow channel, the impeller does work on the liquid and transfers a part of the energy to the liquid. However, the high-lift submersible pump will generate centripetal force during the working process. The conventional multi-stage submersible pump fixes the impeller on the pump shaft by means of series connection, and the rotor bears the axial force generated by the impeller during operation. Pumps generally use balance holes, thrust bearings, and water-lubricated thrust bearing structures to balance the axial force, but these methods may cause bearing damage, requiring frequent replacement of bearings, balance discs, etc., which is time-consuming and labor-intensive.

To this end, Chinese utility model patent CN211039076U provides a floating impeller multi-stage submersible pump, which consists of a submersible motor, a water inlet, a pump casing, an impeller, a pump shaft and a pump water outlet. The submersible motor is connected to the pump shaft, and each stage of the impeller Installed in the corresponding pump casing, the impeller can slide axially on the pump shaft, the front thrust washer is installed on the front cover of each stage of the impeller, and the rear thrust washer is installed on each stage of the impeller. The impeller transmits the axial force generated during its operation to the pump casing through the thrust washer. The guide vane holes of the impeller hub and the pump casing are designed to be longer than conventional pumps. Due to the axial unloading and radial centralizing structure, When working, the impeller slides on the shaft, and the axial force generated is transmitted to the pump casing by the impeller, and the axial force on the shaft is reduced to a certain extent, thus avoiding the damage of the axial force to the bearing, so as to improve the small and service life of submersible pumps. However, the above-mentioned floating impeller multistage submersible pump has the following disadvantages:

(1) The axial force is transmitted to the pump casing through the thrust washer, and the guide vane holes of the impeller hub and the pump casing are long, which affects the floating of the impeller, and its floating bearing effect on the axial force is poor;

(2) An impeller mouth ring is machined on the impeller, and the impeller mouth ring and the pump casing mouth ring hole are matched with clearance. When the impeller is running, the impeller mouth ring and the pump casing are seriously worn, and the impeller mouth ring mainly prevents the medium from flowing back at the outlet end. The sealing effect of the inlet end and the wear of the mouth ring will cause the gap of the mouth ring to increase, which will affect the sealing performance of the mouth ring.

In view of this, it is urgent to improve the structure of the impeller for multi-stage submersible pumps to improve the balance effect of the impeller axial force and reduce the wear between the impeller mouth ring and the pump casing.

SUMMARY OF THE INVENTION

The technical problems to be solved by the present invention are the problems that the existing multi-stage submersible pump impeller has poor effect of balancing axial force, serious wear of the impeller orifice ring, and affects the sealing performance of the orifice ring.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is as follows:

An impeller assembly for a multistage submersible pump, comprising an impeller shell, wherein the impeller shell is provided with:

The impeller is sleeved on the pump shaft and can slide along the axial direction of the pump shaft. The lower end of the impeller is provided with a liquid inlet part, and the fluid medium enters the impeller through the liquid inlet part; the impeller is provided with a liquid flow channel communicated with the liquid inlet;

The guide vane is arranged above the impeller, and is inserted and fixed with the impeller shell, and a liquid outlet cavity communicating with the liquid flow channel is formed between the impeller and the impeller shell; the top surface of the impeller shell A liquid outlet is provided, which is communicated with the liquid outlet cavity; the impeller casing is floatingly sleeved on the pump shaft;

The mouth ring is movably arranged between the outer side surface of the liquid inlet part and the inner side surface of the impeller shell through the mouth ring seat.

In this solution, the impeller includes:

a wheel hub, sleeved on the pump shaft, the inner side of which is matched with the pump shaft;

The upper cover plate and the lower cover plate are arranged on the upper part of the hub, the opposite ends of the upper cover plate and the lower cover plate are provided with blades, and the upper cover plate, the lower cover plate and the blade surround into a liquid flow channel;

The liquid inlet part is cylindrical, is arranged on the bottom surface of the lower cover plate, and communicates with the liquid flow channel.

In this solution, the impeller housing includes:

The lower impeller shell is a hollow cylindrical impeller shell, and the upper part of its inner wall extends inward to form a guide vane seat, an impeller hole is arranged in the center of the guide vane seat, and the impeller is rotatably arranged in the impeller hole; A guide vane installation hole is provided on the top surface of the vane seat, and the guide vane is inserted into the guide vane installation hole; the lower part of the inner wall of the lower impeller shell and the impeller form a liquid inlet cavity, and the mouth ring set in the liquid inlet cavity through the mouth ring seat;

The upper impeller shell is provided with a liquid outlet on its top surface, the hub of the impeller assembly of the lower stage is inserted into the liquid outlet of the impeller assembly of the upper stage, and the liquid inlet of the impeller assembly of the lower stage is connected with the liquid outlet of the impeller assembly of the upper stage. relative settings.

In this solution, the guide vane includes:

The top surface of the conical disk is provided with anti-guide vanes in the radial direction, and the anti-guide vanes are arranged opposite to the upper impeller shell to form a guide channel, and the guide channel communicates with the liquid outlet chamber and the liquid outlet. mouth;

The positive guide vane blades are arranged at the bottom edge of the conical disc at equal intervals, the lower end of the positive guide vane vane is inserted into the guide vane installation hole, and the two adjacent positive guide vane vanes are placed between the two adjacent positive guide vane blades. A pressure relief port is formed therebetween, and the pressure relief port communicates with the liquid flow channel and the liquid outlet chamber.

In this solution, the mouth ring seat is an annular seat, the inner side of which is matched with the outer side of the liquid inlet portion, and the outer side is matched with the inner side of the lower impeller shell. A mouth ring groove is provided on the side of the top surface close to the inner side surface, the mouth ring is arranged in the mouth ring groove, and the outer diameter of the mouth ring groove is larger than the outer diameter of the mouth ring.

In this solution, a stainless steel impeller sheath is sleeved on the liquid inlet.

In this solution, the bottom end of the hub is provided with a lower backstop bearing, and the top end of the guide vane is provided with an upper thrust bearing.

In this solution, the pump shaft is a prism shaft.

In this solution, there is a moving space between the conical disk and the upper cover plate.

In this solution, the depth of the mouth ring groove is greater than the thickness of the mouth ring.

Compared with the prior art, the impeller assembly for a multi-stage submersible pump provided by the present invention includes an impeller shell and an impeller, a guide vane and a mouth ring arranged in the impeller shell. The guide vane is set above the impeller, and the floating sleeve is set on the pump shaft. The guide vane can be eccentric or inclined to float and carry the axial force generated by the operation of the impeller, which improves the balance effect of the axial force. The middle mouth ring of the present invention is movably arranged between the impeller and the pump casing through the mouth ring seat, so as to avoid wear with the impeller or the pump casing and increase the impeller gap, thereby improving the sealing performance of the mouth ring and the operation efficiency of the submersible pump.

Description of drawings

Fig. 1 is the structure disassembly drawing of impeller assembly in the present invention;

Fig. 2 is the sectional view of the impeller assembly in the present invention;

3 is a cross-sectional view of a multi-stage impeller assembly in the present invention;

4 is a schematic structural diagram of a guide vane in the present invention;

FIG. 5 is a schematic structural diagram of an impeller in the present invention.

Wherein, the corresponding relationship between each reference sign and component name in Fig. 1 to Fig. 5 is as follows:

2 impeller, 3 guide vane, 4 ring, 5 ring seat, 21 hub, 22 upper cover, 23 lower cover, 24 liquid inlet, 210 lower thrust bearing, 25 vanes, 26 liquid flow channel, 27 outlet Liquid cavity, 28 stainless steel impeller sheath, 11 upper impeller shell, 12 lower impeller shell, 121 guide vane seat, 122 impeller hole, 123 guide vane mounting hole, 124 liquid inlet cavity, 110 liquid outlet, 31 conical disc, 32 Positive guide vane, 310 reverse guide vane, 311 guide channel, 312 upper thrust bearing, 33 pressure relief port, 51 ring groove.

Detailed ways

The invention provides an impeller assembly for a multi-stage submersible pump. The guide vane floating on the pump shaft is used to carry the axial force generated by the rotation of the impeller, thereby improving the balance effect of the axial force of the impeller; the mouth ring moves through the mouth ring seat. The setting prevents the wear between the mouth ring, the impeller and the pump casing, which leads to the increase of the mouth ring gap, and improves the sealing performance of the mouth ring. The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments of the description.

As shown in Figure 1, Figure 2 and Figure 3, the present invention provides an impeller mechanism assembly for a multi-stage submersible pump, comprising an impeller housing, an impeller 2, a guide vane 3 and a mouth ring 4 arranged in the impeller housing, the guide vane 3 is inserted on the impeller shell, and the floating sleeve is set on the pump shaft. The impeller 2 is arranged below the guide vane 3 and can slide axially along the pump shaft. The mouth ring 4 is movably arranged between the impeller 2 and the impeller casing through the mouth ring seat 5 .

As shown in Figures 1 and 5, the impeller 2 includes a hub 21, an upper cover plate 22, a lower cover plate 23 and a liquid inlet 24. The hub 21 is used to be sleeved on the pump shaft and is adapted to the pump shaft. is the prismatic axis. The bottom end of the wheel hub 21 is provided with a lower thrust bearing 210 . The upper cover plate 22 and the lower cover plate 23 are sleeved on the upper end of the hub 21 , the opposite ends of the upper cover plate 22 and the lower cover plate 23 are provided with blades 25 , and the upper cover plate 22 and the lower cover plate 23 and the blades 25 are surrounded by liquid circulation. Road 26. The liquid inlet portion 24 is cylindrical, is disposed on the bottom surface of the lower cover plate 23 , and communicates with the liquid flow channel 26 . The upper cover plate 22 and the lower cover plate 23 of the impeller 2 and the impeller shell enclose a liquid outlet chamber 27 , and the liquid outlet chamber 27 communicates with the liquid flow channel 26 . The liquid inlet part 24 is covered with a stainless steel impeller sheath 28 to prevent the liquid inlet part 24 on the impeller 2 from being worn.

The impeller shell includes an upper impeller shell and a lower impeller shell 2. The lower impeller shell 2 is a hollow cylindrical impeller shell, and the upper part of its inner wall extends inward to form a guide vane seat 121. The center of the guide vane seat 121 is provided with an impeller hole 122. The impeller 2 The rotation is arranged in the impeller hole 122; the top surface of the guide vane seat 121 is provided with a guide vane installation hole 123, and the guide vane 3 is inserted into the guide vane installation hole 123; The liquid cavity 124 and the mouth ring 4 are arranged in the liquid inlet cavity 124 through the mouth ring seat 5 . A liquid outlet 110 is provided on the top surface of the upper impeller housing.

As shown in FIG. 4 , the guide vane 3 includes a conical disc 31 and a positive guide vane blade 32. The conical disc 31 is sleeved on the pump shaft, and its top surface is radially provided with a reverse guide vane 310. The reverse guide vane 310 is connected to the upper impeller. The inner walls of the shell are disposed opposite to each other, forming a guide channel 311 , and the guide channel 311 communicates with the liquid outlet chamber 27 and the liquid outlet port 110 . The top end of the conical disc 31 is provided with an upper thrust bearing 312. In a multi-stage submersible pump, the hub 21 of the impeller assembly of the next stage is inserted into the liquid outlet 110 of the impeller assembly of the previous stage, and the inlet of the impeller assembly of the next stage is inserted into the liquid outlet 110 of the impeller assembly of the next stage. The liquid part 24 is arranged opposite to the liquid outlet 110 of the impeller assembly of the previous stage, and the lower thrust bearing 210 is arranged opposite to the upper thrust bearing 312 . There is a moving space between the bottom surface of the conical disk 31 and the top surface of the upper cover plate 22 . The positive guide vane 32 is arranged on the bottom edge of the conical disc 31, the positive guide vane 32 is arranged at equal intervals, the lower end of the positive guide vane 32 is inserted into the guide vane installation hole 123, and the two adjacent positive guide vanes are A pressure relief port 33 is formed between the vanes 32 , and the pressure relief port 33 communicates with the liquid flow channel 26 and the liquid outlet cavity 27 .

The mouth ring seat 5 is an annular seat, its inner side is matched with the outer side of the liquid inlet 24, its outer side is matched with the inner side of the lower impeller shell 2, and the top surface of the mouth ring seat 5 is close to the side of the inner side A mouth ring groove 51 is provided, the mouth ring 4 is arranged in the mouth ring groove 5 , and the outer diameter of the mouth ring groove 51 is larger than that of the mouth ring 4 . The depth of the mouth ring groove 51 is greater than the thickness of the mouth ring 4 .

The using method (working process) of the present invention is as follows:

The impeller 2 is sleeved on the pump shaft. When the motor drives the pump shaft to rotate, the pump shaft drives the impeller 2 to rotate. The fluid medium enters the liquid flow channel 26 of the impeller 2 through the liquid inlet 24 . With the rotation of the impeller 2, due to the imbalance of the upper and lower pressures of the upper cover 23 and the lower cover 24 of the impeller 2, an axial force parallel to the direction of the pump shaft and directed to the liquid inlet 24 is generated, and the axial force passes through the hub 21. The lower thrust bearing 210 is transmitted to the upper thrust bearing 312 of the upper-stage guide vane 3, and the upper-stage guide vane 3 eccentrically or slides according to the axial force transmitted by the upper thrust bearing 312, and floats the axial force. .

During the operation of the impeller 2, the fluid medium enters the liquid flow channel 26 from the liquid inlet 24, is discharged from the pressure relief port 33, and enters the liquid outlet chamber 27. The guide vane 3 is arranged above the impeller 2 and is fixed with the lower impeller shell 2. After entering the liquid outlet chamber 27, the medium enters the diversion channel 311 on the conical disc 31, converts a part of the kinetic energy of the water flow into pressure energy, and then enters the liquid inlet part of the next stage impeller 2 through the liquid outlet 110 on the upper impeller shell twenty four. After the above-mentioned pressurizing process, the fluid medium is finally pressurized and transported to the surface.

During the working process of the impeller 2, the port ring 4 is always pressed against the port ring seat 5 under the action of the interstage pressure to prevent the fluid medium in the liquid outlet chamber 27 from flowing out from the gap between the impeller 2 and the lower impeller shell 2. . The mouth ring 4 is movably arranged in the mouth ring groove 51 on the mouth ring seat 5, and the position of the mouth ring 4 in the mouth ring groove 51 can be adjusted with the eccentricity or sliding of the impeller 2, so that the mouth ring 4 is always kept in a sealed state.

Compared with the prior art, the impeller structure assembly for a multi-stage submersible pump provided by the present invention can realize multi-stage series connection, and the guide vane can float the axial force generated by the operation of the impeller through eccentricity or inclination, which improves the balance of the axial force. Effect. The middle mouth ring of the present invention is movably arranged between the impeller and the pump casing through the mouth ring seat, so as to avoid wear with the impeller or the pump casing and increase the impeller gap, thereby improving the sealing performance of the mouth ring and the operation efficiency of the submersible pump.

In this solution, the shape of the mouth ring groove is adapted to the outer surface of the mouth ring, and the outer diameter of the mouth ring groove is larger than the outer diameter of the mouth ring, which is convenient for the mouth ring to adjust the position of the mouth ring according to the posture of the impeller to realize radial sealing.

In this solution, the depth of the mouth ring groove is greater than the thickness of the mouth ring, and there is a moving space between the upper part of the mouth ring and the lower impeller shell, so that the mouth ring can be impacted and floated with the water flow at the moment of starting the water pump, so as to reduce the damage of the water pump. Starting resistance, with good starting performance.

In this solution, there is a moving gap between the bottom surface of the conical disk on the guide vane and the top surface of the upper cover plate of the impeller, and there is a moving space between the floating bearing of the guide vane and the hub bearing of the impeller, and the floating particles can move with the water flow. The flow in the moving space prevents floating particles from blocking the gap between the impeller and the pump casing, causing the pump shaft to be stuck, and improving the sand resistance performance of the submersible pump.

In this solution, a split design is adopted between the guide vane and the pump casing composed of the impeller base and the guide vane cover, which facilitates replacement according to the different wear conditions of each component, reduces maintenance costs and prolongs service life.

The present invention is not limited to the above-mentioned best embodiment. Anyone should be aware of the structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to those of the present invention shall fall within the protection scope of the present invention. Inside.

Claims (10)

1. an impeller assembly for a multistage submersible pump, is characterized in that, comprises an impeller shell, and is provided with in the described impeller shell: The impeller is sleeved on the pump shaft and can slide along the axial direction of the pump shaft; the lower end of the impeller is provided with a liquid inlet part, and the fluid medium enters the impeller through the liquid inlet part; the impeller is provided with a liquid flow channel, communicated with the liquid inlet; The guide vane is arranged above the impeller, and is inserted and fixed with the impeller shell, and a liquid outlet cavity communicating with the liquid flow channel is formed between the impeller and the impeller shell; the top surface of the impeller shell A liquid outlet is provided, which is communicated with the liquid outlet cavity; the impeller casing is floatingly sleeved on the pump shaft; The mouth ring is movably arranged between the outer side surface of the liquid inlet part and the inner side surface of the impeller shell through the mouth ring seat. 2. The impeller assembly of claim 1, wherein the impeller comprises: a wheel hub, sleeved on the pump shaft, the inner side of which is matched with the pump shaft; The upper cover plate and the lower cover plate are arranged on the upper part of the hub, the opposite ends of the upper cover plate and the lower cover plate are provided with blades, and the upper cover plate, the lower cover plate and the blade surround into the liquid flow channel; The liquid inlet part is cylindrical, is arranged on the bottom surface of the lower cover plate, and communicates with the liquid flow channel. 3. The impeller assembly of claim 2, wherein the impeller housing comprises: The lower impeller shell is a hollow cylindrical impeller shell, and the upper part of its inner wall extends inward to form a guide vane seat, an impeller hole is arranged in the center of the guide vane seat, and the impeller is rotatably arranged in the impeller hole; A guide vane installation hole is provided on the top surface of the vane seat, and the guide vane is inserted into the guide vane installation hole; the lower part of the inner wall of the lower impeller shell and the impeller form a liquid inlet cavity, and the mouth ring set in the liquid inlet cavity through the mouth ring seat; The upper impeller shell is provided with a liquid outlet on its top surface, the hub of the impeller assembly of the lower stage is inserted into the liquid outlet of the impeller assembly of the upper stage, and the liquid inlet of the impeller assembly of the lower stage is connected with the liquid outlet of the impeller assembly of the upper stage. relative settings. 4. The impeller assembly of claim 3, wherein the guide vane comprises: The top surface of the conical disk is provided with anti-guide vanes in the radial direction, and the anti-guide vanes are arranged opposite to the upper impeller shell to form a guide channel, and the guide channel communicates with the liquid outlet chamber and the liquid outlet. mouth; The positive guide vane blades are arranged at the bottom edge of the conical disc at equal intervals, the lower end of the positive guide vane vane is inserted into the guide vane installation hole, and the two adjacent positive guide vane vanes are placed between the two adjacent positive guide vane blades. A pressure relief port is formed therebetween, and the pressure relief port communicates with the liquid flow channel and the liquid outlet chamber. 5 . The impeller assembly according to claim 1 , wherein the mouth ring seat is an annular seat, the inner side of which is matched with the outer side of the liquid inlet portion, and the outer side is matched with the outer side of the lower impeller shell. 6 . The inner side surfaces are adapted, the top surface of the mouth ring seat is provided with a mouth ring groove, the mouth ring is arranged in the mouth ring groove, and the outer diameter of the mouth ring groove is larger than the outer diameter of the mouth ring. 6 . The impeller assembly according to claim 1 , wherein a stainless steel impeller sheath is sleeved on the liquid inlet. 7 . 7 . The impeller assembly according to claim 1 , wherein a lower thrust bearing is provided at the bottom end of the hub, and an upper thrust bearing is provided at the top end of the guide vane. 8 . 8. The impeller assembly of claim 1, wherein the pump shaft is a prismatic shaft. 9 . The impeller assembly according to claim 1 , wherein there is a stringing space between the conical disk and the upper cover plate. 10 . 10. The impeller assembly of claim 5, wherein the depth of the mouth ring groove is greater than the thickness of the mouth ring.

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